77 results about "Bioleaching" patented technology

A bioleaching composition for treating ores or other materials including metals or metal salts is presented, wherein the bioleaching composition includes a biosurfactant and a metal solubilizing agent. The biosurfactant may be a sophorolipid biosurfactant (SLP), and the metal solubilizing agent includes an acid and an oxidizing agent or a microorganism. In a bioleaching process using the bioleaching composition, the metal in the ore may be separated from a solution phase or a non-solution phase. Compositions derived from microorganisms are also provided for the pre-leaching treatment of a metal source, which compositions can be used to reduce impurities in the metal source. The use of the bioleaching composition increases the extraction rate and / or the throughput of the process.

The invention discloses a method for preparing ultra-high-purity quartz by multi-stage synergistic purification of quartz ore, and belongs to the technical field of ultra-high-purity quartz preparation. According to the method, natural quartz ore is used as a raw material, mineral impurities, lattice impurities and inclusions in quartz are deeply removed through multi-stage synergistic processes such as low-temperature plasma activation, biological leaching, supercritical CO2-assisted acid leaching, microwave-assisted chloridizing roasting and pulsed electric field enhanced acid leaching, and finally a high-purity quartz product with the SiO2 purity larger than or equal to 99.998% (4N8 grade) is obtained. According to the invention, a low-temperature plasma activation technology, microbial metallurgy, supercritical fluid extraction and a pulsed electric field strengthening technology are organically combined, so that the energy efficiency bottleneck and environmental protection limitation of a traditional high-purity quartz preparation process are broken through; the obtained quartz sand product can reach the standards of high-purity quartz sand for semiconductor quartz glass and high-purity quartz sand for photovoltaic quartz crucibles.

The invention discloses a method for efficiently leaching waste battery positive electrode powder by using hydrogel to assist bacteria, belonging to the field of resource recovery technology. The invention utilizes hydrogel to assist bacteria to leach valuable metal elements from waste LIBs. The bacteria include L. plants and / or L. acidophilus , the hydrogel is prepared by polyvinyl alcohol and agarose. The present invention creatively applies hydrogel in the bioleaching process, effectively increases the leaching percentage of valuable metals in waste LIBs, and avoids the use of inorganic acid at the same time. Compared with the traditional chemical leaching technology, the method of the present invention has obvious advantages in operational safety and effectively avoids the risk of secondary pollution to the environment. By using microorganisms, not only the efficient recovery of metal resources in the battery is achieved, but also the environmental friendliness of the whole process is ensured.

The present invention discloses a method for recovering zinc, lead, and silver from zinc-oxygen press slag using a combination of microbial leaching and chloride leaching. This method simultaneously recovers zinc, lead, and silver from zinc-oxygen press slag through a process of crushing, slurry adjustment, acid balancing, bioleaching, solid-liquid separation, slurry adjustment, chloride leaching, and solid-liquid separation. The leaching rates for zinc, lead, and silver are ≥95%, ≥95%, and ≥90%, respectively. This method offers the advantages of simple process, environmental friendliness, ease of operation, and high recovery of valuable metals.

The present invention belongs to the field of resources and environment, and discloses a method for promoting chalcopyrite bioleaching by in-situ depassivation: in an anaerobic environment, passivated chalcopyrite and reduced sulfur are added to a 9K culture medium, an acidophilic microbial strain is inoculated for culture, and the chalcopyrite is collected by centrifugation; the collected chalcopyrite is dried and added to a 9K culture medium, and the acidophilic microbial strain is inoculated for culture and leaching under an aerobic environment. The present invention introduces acidophilic microorganisms and sulfur into the anaerobic system, so that the dense passivation film of the chalcopyrite can be reduced and removed, allowing the copper ions in the mineral to be leached under aerobic conditions in the later stage. This not only overcomes the shortcomings of pure chemical reaction leaching, such as high energy consumption, high consumables, and environmental pollution, but also solves the problem of low utilization efficiency due to the passivation film hindering leaching during the bioleaching process, so that the chalcopyrite can be utilized to the greatest extent. This in-situ depassivation bioleaching technology has a wide range of applications, low site requirements, and can be used on a large scale industrially.

The invention discloses gluconobacter oxydans for leaching waste printed circuit boards and a leaching method of the gluconobacter oxydans, and belongs to the technical field of microbial resource recovery treatment, lixivium for leaching extraction comprises the gluconobacter oxydans, metabolites of the gluconobacter oxydans and an H2O2 solution, and the H2O2 solution is added to improve the metal leaching percentage and shorten the leaching time. Compared with traditional chemical and biological leaching, efficient leaching of the metal copper in the waste printed circuit board is achieved under the relatively mild condition, safety is higher, and secondary pollution to the environment can be relieved.

The invention relates to the technical field of extraction of rare earth elements by a biological method, and provides a biological leaching method for extracting rare earth elements in fly ash by using aspergillus niger, which comprises the following steps: adding fly ash into a culture medium, sterilizing, inoculating aspergillus niger spore suspension, culturing, filtering leachate, and drying to obtain the rare earth elements, the culture medium consists of the following components in percentage by weight: 1-2% of glucose, 0.5-1.5% of a nitrogen source and the balance of water, the nitrogen source comprises peptone, yeast extract powder and diammonium hydrogen phosphate; the mass ratio of the peptone to the yeast extract powder to the diammonium hydrogen phosphate is 5: 1: (0.05-0.5). Through the technical scheme, the problem of low extraction rate of rare earth elements in related technologies is solved.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

The invention discloses a method for removing heavy metals in sludge, and belongs to the field of environmental protection technology and solid waste recycling. The method comprises the following steps: adding a bioleaching bacteria solution and a nutritive salt solution into dewatered sludge, and adjusting the pH value to form mixed slurry; applying an asymmetric alternating-current electric field to the mixed slurry to perform biological-electrochemical coupling treatment, and performing solid-liquid separation on the treated slurry to respectively obtain purified sludge and leachate containing heavy metals. By utilizing polarization inhibition and oscillation mass transfer effects of the asymmetric alternating-current electric field, the removal efficiency of the bioleaching on the heavy metals in the sludge, especially the organic combined state and residual state heavy metals, is remarkably enhanced, and the method has the outstanding advantages of short treatment period, low energy consumption, no electrode polarization and high heavy metal removal rate.

The invention relates to the technical field of solid waste biological treatment, and discloses La and Ce toxicity resistant thiobacillus thiooxidans and application thereof, and the collection number of the thiobacillus thiooxidans is GDMCC No: 63522. The invention provides a novel thiobacillus thiooxidans, and the preservation number of the novel thiobacillus thiooxidans is GDMCC No: 63522. The strain can highly tolerate La and Ce, and can realize biological leaching of solid wastes rich in La or (and) Ce under high ore pulp density, so that more solid wastes can be treated in a single batch, the biological leaching rate is improved, and the strain has a good application prospect.

The present application relates to the technical field of health, environmental management and resource development, and discloses an alkaline-sulfur oxidizing bacteria and its application in water pollution treatment and bioleaching. The alkaline-sulfur oxidizing bacteria is named 381-2, which has been preserved in the China General Microbiological Culture Collection Center on December 23, 2024, and the preservation number is CGMCC No. 33017; the microbial classification name is Stutzerimonas sp. The present application isolates a new species of Stizolobium strain from a deep-sea hydrothermal area Stutzerimonas sp. . The strain has strong and rapid oxidation ability of thiosulfate ions, and also has the characteristics of producing alkali, so it can be applied to the fields of water pollution treatment and bioleaching.

A bioleaching reactor for removing heavy metals in industrial sludge relates to the technical field of environmental protection equipment, and is characterized in that a venturi mixer is fixedly arranged on the left side of the upper part of a reaction cylinder, and two liquid inlets of the venturi mixer are respectively connected with a sludge conveying pipe and a bacterial liquid conveying pipe; a material guide frame is fixedly arranged at the position, located above the solid-liquid separation assembly, in the reaction cylinder, the motor is fixedly arranged on the upper portion of the reaction cylinder, a stirring shaft is rotationally arranged on the top wall in the reaction cylinder through a bearing, a plurality of stirring blades are connected to a connecting disc through a self-adaptive adjusting mechanism, and spiral propelling pieces are fixedly arranged on a plurality of connecting rods. The stirring shaft is provided with a paddle at the position on the other side of the connecting rod, so that the three-dimensional efficient mixing of the sludge and the bacterial liquid can be realized, the dead angle of mixing is reduced, the angle of the stirring blade can be automatically adjusted through the centrifugal force or resistance during stirring, the shearing force on the high-viscosity sludge is enhanced, the good mixing effect between the sludge and the bacterial liquid can be achieved, and the stirring efficiency is improved. The reaction efficiency is improved.

The present invention relates to a method for recovering metals from waste batteries using a bioleaching process in which a magnetic field is applied. According to the method of the invention, by applying a magnetic field to the bioleaching process, the metal recovery rate can be increased, and valuable metals can be leached. Furthermore, the present invention is environmentally friendly and has a simple and practical process compared to a dry melting process or an acid leaching process mainly used for metal recovery. Accordingly, the metal recovery method of the present invention can recover metals from wastes in the waste resource field, such as waste batteries and waste catalysts, and convert the recovered metals into resources.

The present invention relates to a method for preparing concrete using bioleached residues of cobalt-molybdenum-based waste catalysts. The method involves mixing the bioleached residues, cement, standard sand, and water, stirring the mixture, performing a hydration reaction, and curing the resulting concrete. The advantages of this method are that the bioleached residues of cobalt-molybdenum-based waste catalysts, classified as HW50 hazardous waste, are used as a concrete admixture, reducing cement usage, improving concrete performance, and lowering production costs, thereby achieving resource utilization of waste.

The present invention relates to a method for recovering metals from waste batteries by using a magnetic field-applied bioleaching process. According to the present invention, by applying a magnetic field to a bioleaching process, it is possible to improve the recovery rate of metals, and to leach valuable metals. In addition, the method is environmentally friendly compared to a dry melting process or an acid leaching process, which has been mainly used for metal recovery, and is practical due to a simple process thereof. Therefore, the method for recovering metals of the present invention may recover metals from wastes in waste resources field such as waste batteries and waste catalysts and turn the metals into resources.

The invention discloses a method for preparing high-purity lead sulfate through lead-zinc ore conversion driven by biological oxidation of sulfur, and belongs to the technical field of biological metallurgy. According to the method, sulfate ions are generated in situ and mineral dissolution and lead and zinc metal ion release are promoted through the biological oxidation effect of acidophilic sulfur oxidizing bacteria on sulfur components in lead-zinc ore; and the bioleaching process of minerals is enhanced by optimizing reaction conditions (culture medium composition, pH, temperature, ore pulp concentration and the like). After leaching, Zn < 2 + > exists in a leaching solution, Pb < 2 + > reacts with SO4 < 2-> generated by sulfur biological oxidation in time to form a high-purity lead sulfate precipitate, finally, separation is performed, the precipitate is simply washed and then dried, a lead sulfate product with the purity larger than or equal to 99% is obtained, and the conversion rate gt of Pb to PbSO4 in the lead zinc ore is larger than or equal to 99%; the yield is 99.6%. Compared with a traditional acid leaching method, the method has the advantages of being low in energy consumption, small in pollution, high in metal recovery rate and excellent in product purity, and is suitable for efficient and clean utilization of lead zinc ore resources.

The invention relates to the technical field of sanitation, environmental governance and resource development, and discloses an alkali-producing sulfur oxidizing bacterium and application thereof in water pollution governance and bioleaching. The alkali-producing sulfur-oxidizing bacterium is named as 381-2, is preserved in China General Microbiological Culture Collection Center (CGMCC) on December 23, 2024, and has a preservation number of CGMCC No.33017; the microbial classification is named as Stutzerimonas sp., and the microbial classification is named as Stutzerimonas sp. According to the invention, a new species strain Stutzerimonas sp. Of Stutzerimonas sp. Is obtained by separation from a deep sea hydrothermal zone. The bacterial strain has relatively strong capability of rapidly oxidizing thiosulfate ions and also has alkali production characteristic, so that the bacterial strain can be applied to the fields of water pollution treatment and bioleaching.

The present invention relates to a method for recovering metals from waste batteries by using a magnetic field-applied bioleaching process. According to the present invention, by applying a magnetic field to a bioleaching process, it is possible to improve the recovery rate of metals, and to leach valuable metals. In addition, the method is environmentally friendly compared to a dry melting process or an acid leaching process, which has been mainly used for metal recovery, and is practical due to a simple process thereof. Therefore, the method for recovering metals of the present invention may recover metals from wastes in waste resources field such as waste batteries and waste catalysts and turn the metals into resources.

The invention discloses a method for leaching nickel-cobalt-copper sulfide ore under a near-neutral pH condition. The method comprises the following steps: domesticating and culturing microorganisms under the near-neutral pH condition; construction of a near-neutral biological leaching system (an organism-ligand leaching system); leaching the nickel-cobalt-copper sulfide ore; and finally, leaching liquid containing nickel, cobalt, copper and other valuable metal ions is obtained. According to the method, the pH value of a near-neutral microorganism-ligand leaching system is 5-9, and the pollution risk and the repair problem of a traditional biological leaching acid site are avoided. Meanwhile, biological oxidation avoids the use of a chemical oxidizing agent for chemical oxidation leaching. In addition, the near-neutral environment of the method effectively overcomes the problems that the acid consumption amount is large, the permeability of a leaching pile body is deteriorated and the like when a conventional acid system is used for leaching nickel-cobalt-copper sulfide ore with the high content of basic gangue such as calcium and magnesium, and finally selective efficient extraction of valuable elements is achieved. According to the method for leaching the nickel-cobalt-copper sulfide ore under the nearly neutral pH condition, used equipment is simple, operation is easy, environment friendliness is achieved, and industrial application and popularization can be achieved easily.

The application discloses a method for bioleaching copper and zinc in lead-zinc smelting slag, which comprises adding the lead-zinc smelting slag into an acid culture medium inoculated with acidophilic leaching bacteria domesticated under metal salt stress for a certain period of time. Compared with the prior art, the acidophilic leaching bacteria domesticated under high-concentration metal salt stress can realize efficient leaching of copper and zinc in low-grade lead-zinc smelting slag, realizes waste-to-resource, and converts the original environmental burden into valuable resources, which conforms to the concept of sustainable development and circular economy, and has the advantages of environmental friendliness and low operation cost.

The invention relates to a microorganism-based ionic rare earth ore extraction method in the technical field of rare earth extraction, and the method comprises the following steps: step 1, culturing a microorganism Burkholderia contaminans GP4-1 to obtain an ore leaching bacterial liquid containing microorganisms and metabolites thereof; secondly, the ore leaching bacterial liquid prepared in the first step makes contact with ionic rare earth ore, and a biological leaching reaction is carried out; and thirdly, a leaching mother solution rich in rare earth elements is collected. By means of the method, selective enrichment of heavy rare earth can be achieved.

The invention relates to the technical field of biology, and discloses a method for promoting bioleaching of high-altitude metal sulfides through dandelion extracts.The method comprises the following steps that S1, dandelion plants are dried and smashed, and the dandelion extract rich in flavonoids and phenolic compounds is obtained; s2, culturing low-temperature-resistant and low-oxygen-environment acidic thiobacillus in an acidic culture medium containing ammonium sulfate, magnesium sulfate and ferrous sulfate; s3, the metal sulfide ore is placed in an acid-resistant reactor, and dandelion extract and cultured acidic thiobacillus are added for a leaching reaction; s4, monitoring the metal ion concentration, pH and oxidation-reduction potential; and S5, after leaching is completed, metal ions are recycled. Through the enhancement effect of the dandelion extract on microorganisms, the biological leaching technology has better adaptability in a severe environment, the method can be applied to high-altitude and low-temperature mining areas, the universality of the technology can be remarkably improved by applying the method in the environment, and the application range of the biological leaching technology is widened.

The invention discloses a coupling beneficiation method for gold-bearing copper ore with a high sulfur-copper ratio. Ore existing in an SABC process is subjected to semi-autogenous grinding-ball-milling ore grinding classification, semi-autogenous grinding hard rock is subjected to biological leaching to enrich copper in the ore, a part of coarse-grain gold in a product is directionally enriched and ground through Nelson, and Nelson tailings are subjected to different-speed asynchronous copper separation; a gold-loaded sulfide collecting agent BY-19 is coupled with a low-alkalinity inhibitor BY-23 to enrich micro-fine particle gold into copper concentrate, a BY-80 collecting agent is coupled with microbubble flotation to recover sulfur concentrate, the recovery rate of gold, copper and sulfur is increased, and the method specifically comprises the steps that semi-autogenous grinding-ball milling ore grinding classification is conducted, and copper in semi-autogenous grinding hard rock is enriched through biological leaching; performing Nelson directional enrichment on part of coarse-grained gold in the ground product; carrying out different-speed asynchronous copper separation on the Nelson tailings; a gold-loaded sulfide collecting agent BY-19 is coupled with a low-alkalinity inhibitor BY-23 to enrich micro-fine particle gold into copper concentrate; and sulfur concentrate is recovered through BY-80 collecting agent coupling microbubble flotation. The method has the advantages that the recovery rate of Cu in the copper concentrate can be remarkably increased, loss of valuable metal is avoided, technological indexes are improved, the comprehensive recovery rate of gold is increased to the maximum extent, and the gold recovery rate and the operation recovery rate of sulfur are increased under the condition that the copper selection indexes are consistent.

The application provides an extremely acidophilic iron-sulfur oxidizing bacterium and application thereof in bioleaching of ores. The iron-sulfur oxidizing bacterium (Sulfobacillus thermotolerants) hq2 strain has a preservation number of CGMCC No. 26454. The iron-sulfur oxidizing bacterium provided by the application can oxidize Fe 2+ into Fe 3+ , and can be used for leaching of various low-grade ores and other heavy metals.

This application provides a bioleaching method for low-grade copper ore, comprising the following steps: crushing copper-bearing ore and pyrite separately, screening to obtain copper ore powder and iron ore powder, mixing the copper ore powder and iron ore powder and piling them in a heap leaching column, and burying vertical pipes in the heap to obtain a heap; spraying the heap with acid, then inoculating with leaching bacteria solution to carry out the heap leaching process; the leaching process uses raffinate for circulating leaching. The method of this application uses bioleaching to treat low-grade copper ore, which has the advantages of high leaching rate, low pollution, water conservation, and ease of operation. It overcomes the disadvantages of traditional flotation methods for separating low-grade copper ore, which are not only difficult to process but also have extremely low flotation yields, making it difficult to obtain high-grade copper concentrate.

The invention relates to a method for separating and recovering arsenic and iron from biological leachate containing arsenic and iron, which comprises the following specific steps: adding an adsorbent into the biological leachate containing arsenic and iron, uniformly mixing, reacting, and separating solid and liquid after adsorption is completed to obtain an arsenic-iron solution without bacterial residues; adding a reducing agent into the obtained arsenic-iron solution, detecting that arsenic and iron are respectively converted into trivalent and bivalent, and completing the reaction to obtain a solution containing low-valent arsenic and low-valent iron; an extracting agent is added into the reduced arsenic-iron solution, an arsenic-containing organic phase and an iron-containing raffinate are obtained, the iron-containing raffinate is used for returning for biological leaching, the organic phase is subjected to reverse extraction, an arsenic-containing reverse extraction solution is obtained, and the organic phase obtained after reverse extraction is used for arsenic extraction again; and adding sodium hydroxide into the arsenic-containing strip liquor, uniformly mixing, adding benzyl chloride, stirring for reaction, standing for layering, adjusting acidity for crystallization, and washing and drying the crystal to obtain the benzyl arsonic acid product. The method overcomes the defects of large slag amount, difficulty in product purification, complex process, low arsenic and iron recovery rate and the like in the existing neutralization process, fully recycles arsenic and iron resources in the bioleaching liquid, and has the advantages of high recovery rate, large product additional value, no secondary pollution in the process, low investment and the like.

The present application relates to a kind of vacuum roasting coupling microbial upgrading no-bonding high-sulfur bituminous coal preparation silicon smelting reducing agent method, belong to industrial silicon smelting composite reducing agent technical field.The present application mixes even with bituminous coal powder and corn cob powder and obtains mixture A, hydrogen peroxide solution is added in mixture A and grinds and mixes evenly and obtains mixture B;Mixture B is placed in temperature 800~1200 ℃ under vacuum roasting 30~90min, with furnace cooling and obtains roasting mixture C;Deionized water, bacteria liquid and sodium silicate are added to roasting mixture C, and carry out microbial leaching at temperature 25~65 ℃ for 5~10h, and stratify after standing, remove supernatant;Repeat microbial leaching step until supernatant is neutral, solid-liquid separation, and solid drying obtains low-sulfur composite reducing agent.The low-sulfur composite reducing agent obtained by the present application reaches 91.2~93.7%, and the caking index is 28~53, and the reaction activation energy is 13.4~17.7KJ / mol, meet the requirements of industrial silicon composite reducing agent.

The invention discloses a method for determining lithium in a lithium ore bioleaching solution, and belongs to the technical field of biological metallurgy, the determination method comprises the following steps: preparing a lanthanum nitrate-strontium chloride composite matrix improver, sampling from the lithium ore bioleaching system leaching solution, centrifuging to remove solid impurities, filtering the solid impurities by using a 0.22 [mu] m filter membrane, and collecting the lithium in the lithium ore bioleaching system leaching solution; a sample is diluted for standby application, a lanthanum nitrate-strontium chloride composite matrix improver is added into the sample, the concentration ratio of lanthanum nitrate to strontium chloride in the lanthanum nitrate-strontium chloride composite matrix improver is 1: 2, and the sample is measured by adopting a flame atomic absorption spectrophotometer. The method is especially suitable for bioleaching solution analysis of lithium ore and efficient detection of lithium resources, the inhibition effect of coexisting ions on lithium atomization is avoided through the lanthanum nitrate-strontium chloride composite matrix improver, and the coexisting interfering ions are competitively complexed, background absorption is reduced, and a lithium signal is prevented from being covered, so that the determination accuracy is improved.

An oxidative bioleaching process for leaching a base metal from an ore that includes an ore agglomeration step, an ore stacking step wherein agglomerated ore is stacked to form a heap, a curing step, a rinse step, an inoculation step and a leach step, and wherein, during the ore agglomeration step, the ore is contacted with an acid solution containing nitrate or nitrite thereby to accelerate the leaching rate in the leach step.

The invention discloses a method for biologically leaching lithium in lithium-containing silicate ore by using amino acid, which belongs to the technical field of biological metallurgy, and comprises the following steps: pretreating lepidolite to obtain lepidolite mineral powder, culturing an ore leaching strain in a culture medium, adding the lepidolite mineral powder for domestication, centrifuging a leaching solution, and collecting the domesticated ore leaching strain, thereby obtaining the lithium-containing silicate ore. Preparing a biological leaching system, inoculating the domesticated mineral leaching strain into the biological leaching system, adding glycine, and leaching to obtain a leaching solution. The method is simple in required equipment, mild in reaction condition, low in cost and environment-friendly, and glycine is low in price and easy to obtain.